Building Tips and technical articles. > 1/2 A building.

Twin or multi engine plans

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Paul Smith:
I started to build a Black Hawk XF-5F Skyrocket, but decided it was too small so I up-scaled it about 20%.  It worked well.

In the kit, they use a simple 1/8" balsa wing, which is not NEAR enough to keep two engines together.

The prototype is chronically tail heavy as several modelers learned.

I got NO satisfaction with TeeDee .020's.  Black Widows were good. TeeDee .049's were and still are, the BEST.

Paul Smith:

--- Quote from: Motorman on April 04, 2021, 04:42:36 PM ---Just a word about running a Cox reed with the cylinder ahead of the prop, they get hot!


Motorman 8)

--- End quote ---

Not mention possible reed damage and NOT using the internal bushing as designed.

944_Jim:
The Mitchell:

944_Jim:
And the Mosquito:
https://www.rcgroups.com/forums/showthread.php?2741283-1-2A-Mosquito-w-built-up-wing-profile-fuselage

Paul Smith:
If I build another 1/2A twin I will include a fuel shutoff to avoid the single engine part at the end of the flight.  Measuring fuel seldom works well enough.

I would say, skip the idea of finding plans and just scale something that you and the judges will like.

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